As I mentioned last year, we are moving to a faster release
schedule to get important features out for our users faster.
For instance, our SGen garbage collector has been vastly
improved and should perform better under load, and our
ParallelFX got some real-life testing which helped us improve
it significantly.

SGen Technical Discussion

Mark has been blogging the technical details about the
architecture of the SGen garbage collector, you can read the
documents here: